CVE-2026-103249 n8n - Stored XSS

n8n < 1.123.80, 2.0.0 < 2.39.6, and 2.40.0 < 2.40.1 contain a stored XSS caused by improper sanitization of Resource Locator parameter dropdown link, letting workflow authors execute arbitrary JavaScript in editor origin when other users interact with the node dropdown, exploit requires other users to open the node dropdown and click the external-link icon.

CVSS base score 7.6 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.21% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Stored XSS
Impact
Client Script Exec
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
Published
1 October 2026
Updated
15 October 2026
Weakness
CWE-79

Vendor fix

Update to version 1.123.80, 2.39.6, 2.40.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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